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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - AFS) (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Amortized Cost $ 2,483,154 $ 2,444,135
Gross Unrealized Gains 20,575 9,614
Gross Unrealized Losses 88,392 115,544
Fair Value $ 2,415,337 $ 2,338,205
Weighted Average Yield 4.34% 4.29%
Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 2,481,237 $ 2,442,436
Gross Unrealized Gains 20,575 9,613
Gross Unrealized Losses 88,392 115,544
Fair Value $ 2,413,420 $ 2,336,505
Weighted Average Yield 4.34% 4.29%
Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,917 $ 1,699
Gross Unrealized Gains 0 1
Gross Unrealized Losses 0 0
Fair Value $ 1,917 $ 1,700
Weighted Average Yield 3.72% 4.06%
FNMA and FHLMC certificates | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost   $ 1,981,787
Gross Unrealized Gains   5,545
Gross Unrealized Losses   74,451
Fair Value   $ 1,912,881
Weighted Average Yield   4.46%
FNMA and FHLMC certificates | Due from 1 to 5 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost   $ 14,930
Gross Unrealized Gains   0
Gross Unrealized Losses   587
Fair Value   $ 14,343
Weighted Average Yield   2.07%
FNMA and FHLMC certificates | Due from 5 to 10 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost   $ 23,664
Gross Unrealized Gains   0
Gross Unrealized Losses   1,415
Fair Value   $ 22,249
Weighted Average Yield   1.90%
FNMA and FHLMC certificates | Due after 10 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 2,009,222 $ 1,943,193
Gross Unrealized Gains 14,708 5,545
Gross Unrealized Losses 52,572 72,449
Fair Value $ 1,971,358 $ 1,876,289
Weighted Average Yield 4.51% 4.51%
GNMA certificates | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 467,172 $ 454,881
Gross Unrealized Gains 5,867 4,068
Gross Unrealized Losses 35,726 40,964
Fair Value $ 437,313 $ 417,985
Weighted Average Yield 3.63% 3.57%
GNMA certificates | Due from 1 to 5 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost   $ 6,215
Gross Unrealized Gains   0
Gross Unrealized Losses   177
Fair Value   $ 6,038
Weighted Average Yield   1.74%
GNMA certificates | Due from 5 to 10 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 5,040 $ 11,358
Gross Unrealized Gains 0 10
Gross Unrealized Losses 125 641
Fair Value $ 4,915 $ 10,727
Weighted Average Yield 1.75% 2.25%
GNMA certificates | Due after 10 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 462,132 $ 437,308
Gross Unrealized Gains 5,867 4,058
Gross Unrealized Losses 35,601 40,146
Fair Value $ 432,398 $ 401,220
Weighted Average Yield 3.65% 3.63%
CMOs issued by US government-sponsored agencies | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost   $ 5,768
Gross Unrealized Gains   0
Gross Unrealized Losses   129
Fair Value   $ 5,639
Weighted Average Yield   2.21%
CMOs issued by US government-sponsored agencies | Due from 1 to 5 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost   $ 5,015
Gross Unrealized Gains   0
Gross Unrealized Losses   126
Fair Value   $ 4,889
Weighted Average Yield   1.78%
CMOs issued by US government-sponsored agencies | Due after 10 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 4,843 $ 753
Gross Unrealized Gains 0 0
Gross Unrealized Losses 94 3
Fair Value $ 4,749 $ 750
Weighted Average Yield 2.28% 5.07%
US Treasury securities | Due less than 1 year | Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,384 $ 1,149
Gross Unrealized Gains 0 1
Gross Unrealized Losses 0 0
Fair Value $ 1,384 $ 1,150
Weighted Average Yield 4.23% 4.85%
US Treasury securities | Due from 1 to 5 years | Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost   $ 550
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Fair Value   $ 550
Weighted Average Yield   2.41%
Other debt securities | Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 533  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value $ 533  
Weighted Average Yield 2.39%  
Other debt securities | Due from 1 to 5 years | Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 500  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value $ 500  
Weighted Average Yield 2.35%  
Other debt securities | Due after 10 years | Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 33  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value $ 33  
Weighted Average Yield 2.97%